To someone (like myself) who has little or no knowledge of physics, this book is a REAL eye-opener. It is incredibly exciting, and has a deal of humour to boot. Some parts DO require concentration to get your head around, and I must admit on one or two occasions being slightly lost. Thankfully though 99% of the book was quite easy to follow. Primarily the book is focused on giving the reader an overview of Einstein's Theories of Relativity, and in particular how these could be applicable to time travel. My only slight criticism is that the author does seem to concentrate on building/using time machines from a practical viewpoint, as though the reader is a Sc-Fi fan. Before reading it I thought the universe was born billions of years ago with the Big Bang, and that I was at a certain point in time, and it would carry on ad infinitum after I die. Not necessarily so according to modern physics! A very small sample of amazing information that I learned was: Time could start running backwards if the Universe stops expanding and starts contracting. Time slows down the quicker you go (near the speed of light time almost stops, or speeds up to infinity depending on your viewpoint). Gravity doesn't pull objects, but bends space itself so objects 'fall' into it. Gravity bends time and slows it down. Very heavy gravitation can almost stop time. That the 'present' depends on where you are in space (and your speed), and that all future & past events may co-exist. The book also touches on Quantum Mechanics, which is even weirder i.e. particles appearing from nowhere and being in 2 places at the same time.
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